Commit 0d2f6fd3 authored Nov 02, 2015 by Chris Lesiak Committed by Jonathan Cameron Nov 15, 2015

iio: si7020: Swap data byte order

The Silicon Labs Si7013, Si7020, and Si7021 family of I2C humidity and
temperature sensors deliver 16 bit data high byte first.

See the datasheet available at:
https://www.silabs.com/Support%20Documents%2fTechnicalDocs%2fSi7020-A20.pdf



But as documented in Documentation/i2c/smbus-protocol,
i2c_smbus_read_word_data() expects the low byte first.

Change the driver to use i2c_smbus_read_word_swapped to get correct byte
order.

Signed-off-by: Chris Lesiak <chris.lesiak@licor.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

parent 8546d2e5

drivers/iio/humidity/si7020.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -50,7 +50,7 @@ static int si7020_read_raw(struct iio_dev *indio_dev,

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		ret = i2c_smbus_read_word_data(*client,
		ret = i2c_smbus_read_word_swapped(*client,
		chan->type == IIO_TEMP ?
		SI7020CMD_TEMP_HOLD :
		SI7020CMD_RH_HOLD);